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Old 03-19-2013, 11:45 PM
Green_Will Green_Will is offline
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PTO engage/engine shut down

I have an '06 Scag 48" Velocity deck with the 17hp Kawa. engine. It ran fine last year, no problems. I adjusted the deck height (removed 3 bolts on each side, moved it down to lowest of 3 holes) I ran it today and when I engage the blades the engine shuts down. The engine is not struggling to engage the blades, it shuts down like a safety measure is tripping. Brake and operator paddles and gear engagement shut down the mower properly. I'm assuming moving the deck around possibly loosened the clutch wire? I checked connections-OK, but I did not clean any connections. Any advice here would be appreciated. Thanks.
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Old 03-20-2013, 12:00 AM
Green_Will Green_Will is offline
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For the sake of full disclosure, I also changed the oil, removed sharpened and replaced the blades, greased it, and replaced a broken grease fitting on the "brake plate" on the right wheel.
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Old 03-20-2013, 12:08 AM
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Snyder's Lawn Inc Snyder's Lawn Inc is offline
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Sometimes them safety switches will stick or go bad
I have a 2012 DC and the brake switch will stick and try engage the PTO it will kill engine So I have to shake the brake handle to get un stuck
I have new switch on the shelf to install when I get mower out
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Old 03-20-2013, 07:50 AM
dieselss dieselss is offline
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x2 on the safety switches. start by figuring out which one is bad
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Old 03-20-2013, 08:10 AM
kawakx125 kawakx125 is offline
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on my wright stander there is a circuit board plug, sometimes that'll get dirty connections and shut mine down like you are saying, especially during leaf cleanup season.
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Old 03-20-2013, 09:06 AM
Green_Will Green_Will is offline
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Thanks for the help so far, guys. I'll keep you posted.
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Old 03-20-2013, 09:08 AM
Green_Will Green_Will is offline
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I have another unrelated issue with the mower... should I start a new thread to address that or just post it here?
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Old 03-21-2013, 07:49 PM
Green_Will Green_Will is offline
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So I unplugged, cleaned, and plugged in all the connections on the wiring harness down to the PTO clutch. I also loosened the tension on the belts to rule out the belts being too tight. I can see the spindles turn, but the engine still shuts off. Just to be sure, I deliberately engaged the safety shut off on the brake, drive gear, and the operator present paddles. They work properly. I was sure I had loosened a wire when I moved the cutter deck, but I checked all the wires. Any other ideas?
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Old 03-21-2013, 08:32 PM
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BigFish BigFish is offline
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Could be a bad PTO switch. It's usually more than just a simple on-off switch! It usually controls a couple of circuits, including the kill/grounding cir.
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Old 03-25-2013, 10:16 AM
Green_Will Green_Will is offline
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Thanks for your input so far. Replaced PTO switch-no change. Stumped.
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